I wondered if someone could point me in the correct direction of why this is happening or had something similar happen to them?
While looking at the NPM Summary page I noticed that some of the devices in the "List of Switch Stacks" were showing a Red Status, with both Data Ring and Power Ring status as being Grey/unknown. I checked and the nodes SNMP details are correct, and there are no problems with info coming back from the nodes. The "Switch Stack" sub-page shows correctly when I check the node, and in fact the switch stack information is all there and green.
The switch I've referenced below is a Cisco C9300-48P and running a slightly older IOS version, 17.3.4 which I intend to upgrade to 17.9.4a in the next few weeks.


There are other Cisco C9300 stacks being polled and showing correctly, with a mix of different IOS code versions. I also thought it was because the master switch in this case is not switch 1 in the stack however again I have other “working” stacks which have the master as being other than switch 1, including stacks being a mix of C9300-48P and C9300-24U.
Any ideas or pointers would be much appreciated.
Cheers